Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 15 of 15 for “"Fluidised beds"”.
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Combustion of Coal in Shallow Fluidised Beds
… heat transfer rate especially in very shallow beds. Experimental data on heat transfer in coalfired fluidized beds have been amassed and are in close agreement with theoretical predictions. The contribution of radiation to the total heat transfer has been determined through experiment and …
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The flow behaviour of shallow fluidised beds
The flow behaviour of shallow gas-fluidised beds was studied. experimentally using a rotational viscometer, and an inclined open channel. Initially, tests were carried out with the viscometer in order to establish qualitative trends in the flow properties of a variety of materials over a wide range …
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Solids motion in fluidised beds of fine particles
Although there has been ongoing research on fluidised beds for the past 70 years, the interaction between particles and rising bubbles and the general solids motion in bubbling fluidised beds are still not fully understood. The work presented in this thesis uses the method known as Positron …
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Effect of particle size on slugging fluidised beds
… is concerned mainly with the slug flow regime in fluidised beds, where bubbles are of a size comparable to the column diameter. The fluidising fluid in all cases was air and the particles used were sand, quartz, ballotini and catalyst. The range of particle sizes was about 30 to 500 microns. …
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The behaviour of gas-emitting particles in fluidised beds
… to float or sink when introduced into gas-fluidised beds of Geldart Group B particles. This is relevant, for example, to the fluidised bed combustion of biomass, and the apparent tendency of the fuel to devolatilise predominantly near the upper surface of the bed with the attendant …
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The Investigation of Aspects of Chemical Looping Combustion in Fluidised Beds
… of chemical looping materials within traditional fluidised bed combustion and investigation of the interaction between the fuel, the supplied air and the chemical looping agent. Three topics of chemical looping combustion are discussed, including 1) the Sherwood number in the fluidised bed; 2) …
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Extraction of titania from ilmenite
… is physically well suited to treatment in fluidised beds. The first section of this thesis is an account of a study of the fluidising oharaoteristios of ilmenite sands and of their amenability to treatment at high temperatures with air and chlorine in fluidised beds. The second section of …
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The development of positron imaging systems for applications in industrial process tomography
… dynamics within industrial applications such as fluidised beds and polymer extrusion plant.
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Downstream Processing with Affinity Chromatography. A Study of a Continuous Process for Biospecific Adsorption
… separation experiments were performed with three fluidised beds, namely an adsorption, desorption and wash column, with circulation of solids between the columns. Purities of 83% and 66% were achieved in these runs with complete recovery of trypsin. A continuous process model, also based on the …
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Solids mixing and segregation in a gas spout-fluid bed-effect of the distributor design
… effect of distributor design in the conventional fluidised bed and of variation of the gas inlet diameter in a spouted bed were also briefly investigated for purpose of comparison. Large particles were selected for study because they are becoming increasingly important in industrial fluidised beds …
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Optimisation of Co-Firing of High Moisture Biomass with Coal in a Bubbling Fluidised Bed Combustor
… a particular view of enhancing the of coal fired fluidised bed hot gas generator (HGG) at the Cantley factory of British Sugar. It covers combustion of coal and biomass and their blends also called co-firing in a fluidised bed combustor. Particularly it focuses on the effect of introduction of …
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Investigation of Multiphase Reactor Hydrodynamics Using Magnetic Resonance Imaging
… bed (gas, liquid, solid), and a gas-solid fluidised bed. These reactors were selected as they commonly demonstrate local hydrodynamic anisotropy which affects the global performance of industrial units. MRI was used to obtain 2D velocity images of the gas and liquid phases in the packed …